What is the pin mapping from the rj45 to db9 pins?

I'm sorry but I don't know what the pin mapping is. Because they come as a matched pair of adaptors it didn't matter to me. I used one at each end of a standard 25 foot Cat5e patch cable to make a long DB9-Male to DB9-Female cable and it has been working with no problems for over 6 months. I have previously used other similar adaptors and as you probably suspect there is no standardization. That is why this matched set was appealing.

will this cable convert the signal, so that it can be seen on a computer monitor ?

The RJ45 to RS232 cable is not for video. A DSub15 is the standard connector for VGA video. RS232 is a serial data standard.

Will this work with any usb-rj45 cable with your adapter? so far i cannot get it to work. my cable usb-rj45 works fine, but this doesn't. any ideas

Your question does not make any sense in this context. You say your "cable USB-RJ45 works fine" but you asked this about an RJ45 to RS-232 adaptor. Why would you even expect it to work? RS-232 and USB have nothing in common.

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RJ45 to RS232 Cable, DB9 9-Pin Serial Port Female&Male to RJ45 Female Cat5/6 Ethernet LAN Console（18CM/7Inch） 2Pack

Product ID: 167328644

Details

Brand
zdyCGTime
Connector type
RJ45
Cable type
Ethernet
Compatible devices
Monitor
Special feature
不缠结

📦2-pack for paired use

🔄RS232 signal over Ethernet cable

🔌18cm compact length

¥3600

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔗 Connect Smarter, Not Harder – Your Serial Console’s Best Friend!

RS 232 OVER ETHERNET - Transmits serial signals via Cat5/6 cables without external power or converters.
COMPACT 7 INCH DESIGN - Perfectly sized 18cm length for clutter-free, efficient workspace setups.
PLUG PLAY DUAL PACK - Includes both DB9 Male & Female to RJ45 Female cables for seamless paired connectivity.
RELIABLE SIGNAL TRANSMISSION - Supports distances up to 15 meters ensuring stable, lag-free console connections.
UNIVERSAL SERIAL COMPATIBILITY - Connects effortlessly to computers and monitors with DB9 9-pin serial ports.

This 2-pack RJ45 to RS232 cable set features DB9 9-pin serial port connectors (male and female) transmitting RS232 signals over standard Cat5/6 Ethernet cables. At a compact 18cm length, these cables require no external power and support reliable data transmission up to 15 meters, ideal for professional console and device management setups. Designed for paired use only, they enable seamless serial communication between computers and monitors, making them essential for IT managers and tech-savvy professionals.

Specifications

ASIN	B07DCPVLBC
Audio jack	Rj45
Best Sellers Rank	30,058 in Computers & Accessories ( See Top 100 in Computers & Accessories ) 59 in Serial Cables
Colour	BLACK
Customer Reviews	4.5 4.5 out of 5 stars (318)
Date First Available	29 May 2018
Frequency	250 MHz
Guaranteed software updates until	unknown
Item Weight	80 g
Item model number	8541684836
Other display features	Wireless
Package Dimensions	16.7 x 10.7 x 2.5 cm; 80 g
Special features	DB9 9-Pin Serial Port Female&Male to RJ45 Female

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